使用正则表达式从谷歌地图嵌入链接中提取src

Question

各位大家好，感谢您的阅读。 我有这样一个链接：

<iframe width="425" height="350" frameborder="0" scrolling="no" marginheight="0" marginwidth="0" src="https://maps.google.it/maps?f=q&amp;source=s_q&amp;hl=en&amp;geocode=&amp;q=monte+rosa&amp;aq=&amp;sll=45.454082,9.213138&amp;sspn=0.009016,0.01929&amp;t=h&amp;gl=it&amp;ie=UTF8&amp;hq=&amp;hnear=Monte+Rosa,+Province+of+Varese,+Lombardy&amp;ll=45.690627,8.824349&amp;spn=0.008978,0.01929&amp;z=14&amp;iwloc=A&amp;output=embed"></iframe><br /><small><a href="https://maps.google.it/maps?f=q&amp;source=embed&amp;hl=en&amp;geocode=&amp;q=monte+rosa&amp;aq=&amp;sll=45.454082,9.213138&amp;sspn=0.009016,0.01929&amp;t=h&amp;gl=it&amp;ie=UTF8&amp;hq=&amp;hnear=Monte+Rosa,+Province+of+Varese,+Lombardy&amp;ll=45.690627,8.824349&amp;spn=0.008978,0.01929&amp;z=14&amp;iwloc=A" style="color:#0000FF;text-align:left">View Larger Map</a></small>

我想只提取这个

https://maps.google.it/maps?f=q&source=s_q&hl=en&geocode=&q=monte+rosa&aq=&sll=45.454082,9.213138&sspn=0.009016,0.01929&t=h&gl=it&ie=UTF8&hq=&hnear=Monte+Rosa,+Province+of+Varese,+Lombardy&ll=45.690627,8.824349&spn=0.008978,0.01929&z=14&iwloc=A&output=embed

换句话说，我想在src =“之前提取所有内容，直到链接结束”。 我一直在尝试使用正则表达式，但我无法弄清楚正确的语法。一些帮助将非常感激。

Answer 1

$html = '<iframe width="425" height="350" frameborder="0" scrolling="no" marginheight="0" marginwidth="0" src="https://maps.google.it/maps?f=q&amp;source=s_q&amp;hl=en&amp;geocode=&amp;q=monte+rosa&amp;aq=&amp;sll=45.454082,9.213138&amp;sspn=0.009016,0.01929&amp;t=h&amp;gl=it&amp;ie=UTF8&amp;hq=&amp;hnear=Monte+Rosa,+Province+of+Varese,+Lombardy&amp;ll=45.690627,8.824349&amp;spn=0.008978,0.01929&amp;z=14&amp;iwloc=A&amp;output=embed"></iframe><br /><small><a href="https://maps.google.it/maps?f=q&amp;source=embed&amp;hl=en&amp;geocode=&amp;q=monte+rosa&amp;aq=&amp;sll=45.454082,9.213138&amp;sspn=0.009016,0.01929&amp;t=h&amp;gl=it&amp;ie=UTF8&amp;hq=&amp;hnear=Monte+Rosa,+Province+of+Varese,+Lombardy&amp;ll=45.690627,8.824349&amp;spn=0.008978,0.01929&amp;z=14&amp;iwloc=A" style="color:#0000FF;text-align:left">View Larger Map</a></small>';
preg_match('~iframe.*src="([^"]*)"~', $html, $result);
var_dump($result[1]);